Sandpapering-machine pad.



No. 738,956. PATENTED SEPT. l5, 1908` C. C. STUART.

SANDPAPBRING MACHINE PAD.

AAAAAAA 'non FILED 00124. 1902.

:PATENTED SEPT. 15, 1903.

C. G..STUART. SANDPAPERING MACHINE PAD.

APPLICATION FILED 00T. 24, 1902.

2 SHEETS-SHEET 2.

N0 MODEL.

mr muws PETERS co. Pwrovmm., www'.

l ToA @ZZ whom it may concern:Y l

UNITED STATES] Patented september 15, 19031" "PATENT OFFICE.

oHARLEs c.V STUART, oF'. oAMPvILLE, coNNncrIoUr, AssIeNoRTo cREswELL aWATERS co.,vA ooRPoRATIoN oF PENNSYLVANIA.

SAN DPAPERlNc-MAol-UNE Vr-EAD.

VsriscIFIcArIcyrrforming part of Letters rat'ent No. y'73r-3,95e, ateaseptembery 15, 1903.

Application nea oa'obr 24,196.2. semina. matto. (No model.)

Be it known that I, CHARLES C. S'rUART,a citizen of the UnitedStates',residing at Camp-4 ville, inthe county of Litcheld'and StateofConnecticut, have invented `certain new and usefullmpr'ovements inSandpaperin'g #Mar chine Pads, of which the following is a'sp'ecification.` Y My invention relates to sandpapering-ma# chines,- and hasforits objectthe combined use yof abrasive rotary drums and abrasive re`ciprocating pads for finishing the stock or ma,- terial passedthereunder upon the machin'es platen or bed, together'with means wherebythe pads are reciprocated by mechanism attached to the machine and avpart thereof driven by the same power. The pads are also provided withindependent means, whereby they may be separately employedor' put out ofemployment. Y Itis designed to provide the pads with fine sandpaper fornishing the Work and to employ the one for such purpose which the stockis passed under after it has passed under the drums which are coatedwith coarse, medium, and line sandpaper, in the order named, .whichalso" indicates the course of the stock through the machine whenbeingnished.

My mechanism 1s illustrated in the accompanying drawings, in which-Figure 1 is a side elevation of so much of the machine asis necessary toillustrate the mechanism. Fig. 2 is a partial plan or top View 'showinga portion of the parts, as the pad-drivingmechanism of one side, for itsreciprocation, and the pad relative position .to the drums. The parts ofthe driving mechanism not shown (for the opposite side of the machine)are duplicates of those shown, and the positions of the other parts canreadily be understood by reference to Fig. 1. Fig. 3 is an end view ofthe pad-carrier. Fig. 4 is an edge view of the pad-carrier. Fig. 5 is'adetail of the pad-elevating mechanism.

Similar figures of reference indicate similar parts throughout `theviews.

The machine has a central framework 1, from which at either end areextensions 2 3, on which are located the necessary appliances for movingand supporting the platen 4. Such appliances being well known'in theart, itis not deemed necessary to enter into Yany -special' descriptionof them. The machine is provided with drums 5 6 7, .whereon is placedabrasive material, preferably coarse, medium and fine', in the ordernamed.. These drums are rotated in` opposite directions, as indicated bythe arrows, by a belt 8common to all, whichy passes over their pulleys 910 11, intermediate pulleys 12 13, and is Ydriven by pulley4 14. Thesepulleys and drums are provided with suitable shafts 15 1(5"17 1S 19 2Oandbearings 21 l22 23 242526 therefor; Secured at each end of framework1, at each side above platen 4, are guides 27 28, on which the pads 2930 are carried for reciprocating movement parallel to platen 4 and thestock operated on. Y

Reference to Figs.' 3, 4, 5 will best show the pad construction, whereinguides 2728.are embraced by horizontal'hubs`31fof consid erable length.At the back of hubs 31 are formed vertical bosses 32 33, rising from :aplate 34. 'On plate 34 and extendingbelow it are vertical bosses3536,'andthroughA these bosses are rods 37 '38, which supportholders 39,under which the pads 29 30 are secured at each end by bolts 40. Throughholders 39 are spring-rods 41, screW-threadedin the holders, passingfreely through plates' 34, and having heads 42, which enter pads 29 30,act ing as means to supportthe padsfrom being displaced when doing theirwork of abrasion. Y

Around rods 41, secured between Vplates 34 and holders 39, are springs43, which permit the yielding of the pads 29 30. Lifters 44'and operatedby pin 52 are provided for raising pads 29 30 clear of the stock to makethem inoperative-as, for example, when the platen 4 is moving from A inthe direction of the arrow with rough stock the pad would be lifted toallowthe stock to first be operated upon by the drums, 5 rough, 6Inedium, 7 smooth, and by pad 30 superflue, and upon the return movementof the platen pad 29. can be lowered to add its finish to that alreadyproduced by pad 30. The lifters comprise a plate 45, having hubs 46 47,embracing rods 37 33 and nuts 48 49, which regulate the tension onsprings 43. Under hubs 3l and at right angles .thereto are hubs 50, inwhich and reaching across the machine above pads 29 30 are shafts 5l,which connect opposite hubs 50. At a point under plates 45 the shafts 5lare provided with pins 52, which in their inoperative positions, as seenin Figs. 3, 5, do not engage plates 45; but when shaft 5l is rotated tocarry pins 52 upward they act as cams to raise plates 45, rods 37 38,holders 39, pads 29 30, and compress springs As pins 52 reach a verticalposition they enter notches 53, suspending the pads until suoli time asthe operator disengages them.

The driving mechanism for reciprocating the pads are a pinion 54 onshaft l5 engaging a gear 55 on shaft 56, supported in bearings 57,together with pinions 5S, also on shaft 56, which engage gears 59 onshafts GO, supported in bearings Gl of frames 62, which are pivotallysupported on shaft 56 at their outer end and at theirinner ends byknuckle-pins 63 to lugs 64, attached to framework l. Bosses 65 on gears5f) have crank-pins 66, and thereon are connecting-rods 67, which attheir inner ends engage pins G8 in levers 69. The levers (59 arefulcrumed at 70 to bars 7l, pivotally supported at 72 to framework l.The upper ends of levers 69 are secured to shaft 5l, and all of theseparts except pinion 54 and gear 55 are in duplicate at each side of themachine.

In order to allow the upper ends of levers G9 to move in a straight lineinstead of an are, their fulcrum 70 must move upward as the lever moveseach way from its vertical central position to its extreme limit ofmotion, and this is permitted by pivots "2. This also causes the lowerends of levers G9 to move in an irregular curve, due to the gradualraising of fulcrum 70. Connecting-rods 67 limit the movement of thelower ends of levers 65); but as pads 29 30 are free to move with theupper ends of the levers to their limit the difference in movementbetween an arc from a fixed fulcruln and a straight line from a movablefulcrum is readily accomplished. Fulcrums 70 have guides 73, throughwhich are passed rods 7 4, attached to arms on shaft 5l, and are themeans employed to rotate the shaft and cause pins 52 to elevate lifters44, which elevates the pad to its inoperative position, above and out ofcontact with the stock. Above guides 73 stops 76 are attached to rods74, each being provided with a handle 77. The stops abut guides 7 whenthe pads are dropped to their operative position. Pad 30 is similarlyequipped except that pivots 70 for its guides 7 3/ are secured tosupports 7S, rigidly secured to framework l. Pads 29 30 are connectedfor simultaneous movement by rods 79, secured to lugs SO on hubs 3l.

I claim-` 1. In a sandpapering-machine, a framework, a platen, multipleabrasive drums above the platen, and means for their rotation inopposite directions, and multiple abrasive pads exterior to the mainframework, and adapted for reciprocative movements, and

means upon the machine for driving the first pad, and connectionstherefrom to the second pad for such movements.

2. In a sandpapering-machine, a framework, a platen, multiple abrasivedrums above the platen, and means whereby the outer drums rotate in onedirection while the center drum rotates oppositely, abrasive padsexterior' to the drums, adapted for reciprocative movements before andafter the stock passes the rolls, means for such movements by mechanismon the machine, and means on each pad to independently place it into orout of operative abrasive position.

3. In a sandpapering-maehine, a framework, a platen, multiple abrasivedrums above the platen, and means for their rotation in oppositedirections, abrasive pads having means on the machine for reciprocatorymovement longitudinally of the machine for one pad, with means for theirconnection so that the second pad shall be driven by the first, andmeans whereby one or both pads may be placed into operative orinoperative position independent of the other pad.

4. In a sandpapering-machine, a movable platen, abrasive drums above theplaten, yielding and reciprocating abrasive pads also above the platenand connected for coperative action, means to independently put a padout of abrasive position either during reciprocation or quiescence,means to rotate the drums, and independent means to reciprocate thepads, operated from the driving mechanism of the machine.

5. In a sandpapering-machine, a platen, abrasive drums above the platen,and means for their rotation in opposite directions, abrasive padsreaching across and above the platen, and` means for their reciprocationlengthwise of the platen, resilient means whereby the pads may press oryield toward the platen and to the stock being Worked, and means tocompress the resilientA means and prevent contact with the stockaforesaid.

6. In. a sandpapering-maehine, a movable platen, abrasive drums abovethe platen and means for their rotation in opposite directions, abrasivepads guided parallel to the platen and reeiprocated longitudinally ofthe platen, levers for reciprocating the pads and driven from themachine, but separately from the drums, pivotally-supported fulerums forthe levers which permit the upper ends of the levers and theirconnections to the pads to move in a line parallel with the platens top,connecting-rods for the levers attached below their fulerums and at thesides of the platen, and means for their` driving.

7. In a sandpapering-machine, reeiprocat- IOO ing pads guided formovement in right lines., late the levers from the machine independentcentrally fulcrumed oscillating levers atof the movements for its othermechanisms. lo tached thereto which at their ends attaehed In testimonywhereof I afx my signature to the pads also move in right lines,movablyin presence of'tWo Witnesses.

5 supported fulerurns for the levers which per- Y CHARLES C. STUART.

mit the pad ends of the levers to move in Witnesses: right lines andtheir driven ends to rise and R. C. WRIGHT,

fail for such movement, and means to osoi1- WILLIAM C. STOEVER.

